Hassan A.  Abdulhadi, Shatha  M. Rajaa, Khairallah  S. Jabur, 
    Improvement of the Impact Properties of Aluminum Alloy Through an Anodization,
    Journal of Engineering and Applied Sciences,
    Volume 14,Issue 16,
    2019,
    Pages 5827-5830,
    ISSN 1816-949x,
    jeasci.2019.5827.5830,
    (https://makhillpublications.co/view-article.php?doi=jeasci.2019.5827.5830)
    Abstract: Aluminum alloys are anodized for enhanced resistance to corrosion and for the improvement of
dyeing, lubrication and adhesion processes. In this research, an anodization process was carried out on AA
5356 by studying two different parameters (time and concentration of sulfuric acid). Hardness test and impact
energy test were adopted to check the effect of anodizing on the alloy. The anodic layer thickness of all the
specimens was measured and from the results, it was found that the thickness increased with an increasing time
and sulfuric acid concentration. An increase in the time of anodizing more than 15 min and a sulfuric acid
concentration of more than 5% increased the toughness of the material by about 40% and decreased the
hardness by about 14%. The thickness of the anodic layer increased with an increasing electrolyte
concentration more than increasing the anodizing time and this led to more decrease in the hardness.
    Keywords: anodized;Aluminum alloys;hardness;adhesion processes;electrolyte;toughness